The Echinoid Directory is an online guide to sea urchins. Maintained by Museum experts, it provides taxonomic information on all the genera and species of echinoid that have been described, as well as information on their morphology and evolution.

Crinoids are the most primitive of the 5 living echinoderm classes. We have a number of projects to develop monographs and guides to particular crinoid faunas, focussing on their Mesozoic fossil record.